Detonating burglar-alarm.



No. 712,005. Patented Oct. 23, I902. I F. m. REYNOLDS.

DE'I'ONATIM? BUBGLAB ALARM.

(Application filed Mar. 19, 1902.)

AUORNEYJ WITNESSES:

: NORRIS mzns co. PHOTO-LYING. wAsmNa'mu. n. c.

UNITED STATES PATENT OFFICE.

FRANK M. REYNOLDS, OF KNOXVILLE, IOWVA.

DETONATING BU RG LAR-ALARM.

SFEGIFICATION forming part of Letters Patent No. 712,005, dated October 28, 1902.

Application filed March 19, 1902. Serial No. 98,920. (No model.)

To all whom it may concern:

Be it known. that I, FRANK M. REYNOLDS, a citizen of the United States, and a resident of Knoxville, county of Marion, and State of Iowa, have invented certain new and useful Improvements in Detonatin g Burglar-Alarms, of which the following is a specification, reference being had to the accompanying drawsimplicity of construction, inexpensiveness' and great durability, capacity for ready application, and assurance of positive and automatic operation when required.

With the above purposes in view the novel burglar-alarm comprises generally an angular leaf-spring of considerable expanding force, the lower horizontal member of which, besides being firmly secured to the lower part i of a vertical plate having a rectangular opening, has its free end extending beyond the same, the other spring member extending through and beyond the vertical opening in the plate and carrying at its upper side, within the plane of the opening, an anvil designed when its member is released after depression to be violently'elevated in contact with "a small abutment carried by the'upp'er portion of the plate at a point within the top of the opening. Obviously with the upper member in a depressed position and both terminals of the spring clamped between the top edge of the door and the door-frame, with the vertical plate and the balance otthe spring supported at that side of the .door to which it opens and a detonating cap placed Within the anvil, the opening of the door will result in its coming in contact with the vertical plate to dislodge the entire device, thereby releasing the depressed end of the upper'member and permitting it to spring upward and violently bring the cap against the abutment to explode the former and give the alarm.

There are also novel details of construction embodied in the said device, which are more same in the position it occupies when not adjusted. Fig. 2 is a vertical sectional view of the said device, the sectio'nbeing taken in the plane indicated by the'dotted line 2 2, Fig. 1, looking toward the rear. Fig. 3 is a plan view of the device as shown in Fig. 1; and Fig. 4 is a fragmentary section of an upper portion of a door and its frame, illustrating the device as adjusted to automatically explode the cap upon the opening of the door.

The lower horizontal member A of the bent leaf-spring A is secured to the vertical plate B, in the bottom of the rectangular opening therein, by having one of side edges or engage a small lateral notch 19 in the lower part of the plate, a book a, integral with said bottom part, extending up through a notch b in the opposite edge of said member and bent over upon the same to complete its securement to the plate. It will be observed that the free end of the member Aextends horizontally beyond the plate B and terminates in a thin blade-like portion o The upper member A of the spring A extendsthrough the opening of the plate B, said member having side notches a receiving freely the inner vertical edges of the plate, by which the member is guided in its vertical movements in the opening of the latter. The free portion of the upper spring member also extends a short distance beyondthe plate and has the bladeterminal a.

Rigidly securedon the upper side of the member A in the plane of the plate B is an anvil 0, having a small annular rim 0. Secured to the upper part of the plate, so as to depend for a short distance within the plateopening, is a cylindrical abutment D, against the under side of which the resiliency of the spring normally tends to hold the anvil.

In practice the spring end of is depressed upon the end c both ends, on account of their blade character, conjointly presenting but a limited thickness. As thus conditioned,

they may be clamped between the upper edge of a closed door E and a contiguous part F of its frame,"so that the device Will be supported in an elevated position at that side of the door on which it opens. A detonating-cap O is placed within the anvil O, as indicated by dotted lines in Fig. 4. Now upon the opening of the door, which Will be some occasion when not ordinarily intended, the door will contact with the lower part of the plate and completely dislodge the device from its position, releasing the depressed member and permitting it to violently throw the anvil upward against the abutment and explode the cap, the detonation of which will serve as an alarm.

As the device is simply and durably made,

it will sustain no injury in falling to the floor from the height at which it was adjusted.

It will be appreciated that the improved detonating burglar-alarm can, while held in a vertical position, be inserted between the meeting-rails of sashes, the movement of one of which will result in the release of the de-.

pressed member and the exploding of the cap. Care should be exercised, however, in this 1 application of the alarm that the cap is placed securely within the anvil.

As before stated, the device is simple, comparatively inexpensive, and may be readily adjusted to any door or window or transom where required.

I do not Wish to be understood as limiting myself to the precise arrangement of parts described, as changes may be made in the details without departing from the spirit of my invention.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is-- 1. A detonating burglar-alarm comprising a vertical plate provided with an opening, a bent leaf-spring one member of which is secured in the bottom of the said opening by engaging at one side a notch in the plate and at the other by having a notch through which extends an integral hook of the plate bent over upon the member, the end portion of the latter extending beyond the plate, the other member extending through and beyond the opening in the plate and carrying an anvil, and an abutment on the plate for cooperating with said anvil.

2. A detonating burglar-alarm comprising a vertical plate provided with an opening, a bent leaf-spring, one member of which is secured in the bottom of the opening by engaging at one side a lateral notch in the plate and at the other by having a notch through which extends an integral hook of the plate bent upon the spring member, an end portion of the latter extending beyond the plate, the other member extending through and beyond the opening in the plate and having side recesses receiving the inner edges of the plate, an anvil located on the free member, and an abutment on the plate cooperating With said anvil.

3. A detonating burglar-alarm comprising a vertical plate provided with an opening, a bent spring having one member secured to said plate at one end of the opening and extending beyond the plate, the other member extending freely through and beyond the opening and carrying an anvil, and an abutment on the plate for cooperating with said anvil; the extended ends of said members terminating in blades.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of two witnesses, this 12th day of Decem' ber, 1901.

FRANK M. REYNOLDS.

Witnesses:

S. (J. JOHNSTON, .H. T. McOonMAoK. 

